Entity Central Index Key Asset acquisition contingent consideration liability noncurrent. Cover [Abstract] Document Information [Table] Document Information [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Common Stock [Member] Common Stock [Member] Common stock underlying warrants. Common Stock Underlying Warrants [Member] Common Stock Underlying Warrants [Member] Document Information [Line Items] Document Information [Line Items] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Current Reporting Status Entity Current Reporting Status Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Ex Transition Period Entity Ex Transition Period Entity Shell Company Entity Shell Company Entity File Number Entity File Number Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address Address Line1 Entity Address, Address Line Two Entity Address Address Line2 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Entity Common Stock Shares Outstanding Entity Common Stock Shares Outstanding Entity Incorporation, State or Country Code Entity Incorporation State Country Code Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Entity Interactive Data Current Entity Interactive Data Current Title of 12(b) Security Security12b Title Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Minority interest investment in subsidiary. Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Warrant or Right Class Of Warrant Or Right [Axis] Class of Warrant or Right Class Of Warrant Or Right [Domain] Series A Warrants [Member] Series A Warrant Liability [Member] Series A Warrants [Member] 2017 PIPE warrant liability. 2017 PIPE Warrant Liability [Member] Two Thousand Seventeen P I P E Warrant Liability [Member] 2018 PIPE warrant liability. 2018 PIPE Warrant Liability [Member] Two Thousand Eighteen P I P E Warrant Liability [Member] Series B Convertible Preferred Stock [Member] Series B Preferred Stock [Member] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Current assets Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Due from related party Due From Related Parties Current Minority interest investment in former subsidiary Minority Interest Investment In Subsidiary Total current assets Assets Current Long-term assets Assets Noncurrent [Abstract] Property and equipment, net Property Plant And Equipment Net Intangible assets, net Intangible Assets Net Excluding Goodwill Other long-term assets Other Assets Noncurrent Total assets Assets Liabilities and stockholders’ equity Liabilities And Stockholders Equity [Abstract] Current liabilities Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued compensation and other current liabilities Accrued Liabilities And Other Liabilities Total current liabilities Liabilities Current Long-term liabilities Liabilities Noncurrent [Abstract] Warrant liability Derivative Liabilities Noncurrent Contingent liability for Essentialis purchase price Asset Acquisition Contingent Consideration Liability Noncurrent Other long-term liabilities Other Liabilities Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 6) Commitments And Contingencies Stockholders’ equity Stockholders Equity [Abstract] Preferred stock Preferred Stock Value Common stock Common Stock Value Additional paid-in-capital Additional Paid In Capital Common Stock Accumulated deficit Retained Earnings Accumulated Deficit Total stockholders’ equity Stockholders Equity Total liabilities and stockholders’ equity Liabilities And Stockholders Equity Preferred stock par value (in dollars per share) Preferred Stock Par Or Stated Value Per Share Preferred stock shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Preferred stock, shares outstanding Preferred Stock Shares Outstanding Preferred stock, aggregate liquidation preference Preferred Stock Liquidation Preference Value Common stock, par value (in dollars per share) Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Asset acquisition contingent consideration change in fair value. Income loss from minority interest investments. Earnings per share from continuing operations. Earnings per share from discontinued operations. Income Statement [Abstract] Operating expenses Operating Expenses [Abstract] Research and development Research And Development Expense General and administrative General And Administrative Expense Change in fair value of contingent consideration Asset Acquisition Contingent Consideration Change In Fair Value Total operating expenses Operating Expenses Operating loss Operating Income Loss Other income (expense) Nonoperating Income Expense [Abstract] Cease-use income Gain Loss On Contract Termination Change in fair value of warrants liabilities Fair Value Adjustment Of Warrants Loss from minority interest investment Income Loss From Minority Interest Investments Interest income, net Other Nonoperating Income Expense Total other income (expense) Nonoperating Income Expense Income (loss) from continuing operations Income Loss From Continuing Operations Loss from discontinued operations Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity Net income (loss) Net Income Loss Income (loss) per common share from continuing operations: Earnings Per Share From Continuing Operations [Abstract] Basic Income Loss From Continuing Operations Per Basic Share Diluted Income Loss From Continuing Operations Per Diluted Share Loss per common share from discontinued operations: Earnings Per Share From Discontinued Operations [Abstract] Basic Income Loss From Discontinued Operations Net Of Tax Per Basic Share Diluted Income Loss From Discontinued Operations Net Of Tax Per Diluted Share Net income (loss) per common share: Earnings Per Share [Abstract] Basic Earnings Per Share Basic Diluted Earnings Per Share Diluted Weighted-average common shares outstanding used in per-share calculation: Weighted Average Number Of Shares Outstanding [Abstract] Basic Weighted Average Number Of Shares Outstanding Basic Diluted Weighted Average Number Of Diluted Shares Outstanding Adjustments to additional paid in capital, stock issued, increase (decrease) issuance costs. Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Additional Paid-In Capital [Member] Additional Paid In Capital [Member] Accumulated Deficit [Member] Retained Earnings [Member] Asset purchase. Asset Purchase Asset Purchase [Axis] Asset purchase. Asset Purchase Asset Purchase [Domain] Essentialis, Inc. Essentialis, Inc. [Member] Essentialis Inc [Member] Balances at beginning Balances at beginning (shares) Shares Outstanding Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase Decrease In Stockholders Equity Roll Forward Stock-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Issuance of common stock on conversion of series B convertible preferred shares Stock Issued During Period Value Conversion Of Convertible Securities Issuance of common stock on conversion of series B convertible preferred shares (shares) Stock Issued During Period Shares Conversion Of Convertible Securities Issuance of restricted common stock for bonuses Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures Issuance of restricted common stock for bonuses (shares) Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures Issuance of common stock to board members in lieu of cash payments for quarterly board fees Stock Issued During Period Value Issued For Services Issuance of common stock to board members in lieu of cash payments for quarterly board fees (shares) Stock Issued During Period Shares Issued For Services Transaction costs for common stock and warrant issuance. Adjustments To Additional Paid In Capital Stock Issued Increase Decrease Issuance Costs Issuance of common stock held back on acquisition of Essentialis Stock Issued During Period Value Acquisitions Issuance of common stock held back on acquisition of Essentialis (Shares) Stock Issued During Period Shares Acquisitions Net income (loss) Balances at ending Balances at end (shares) Payments to security deposit on sublease. Proceeds from sale of minority interest investment in former subsidiary. Cash and cash equivalents period increase decrease included in current assets held for sale. Statement Of Cash Flows [Abstract] Operating Activities Statement Operating Activities Segment [Axis] Operating Activities Segment Operating Activities [Domain] Continuing Operations [Member] Segment Continuing Operations [Member] Discontinued Operations Segment Discontinued Operations [Member] Cash flows from operating activities: Net Cash Provided By Used In Operating Activities [Abstract] Net loss Profit Loss Loss from continuing operations Adjustments to reconcile net loss from continuing operations to net cash used in operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation And Amortization Stock-based compensation expense Share Based Compensation Board fees paid with common stock Other Noncash Expense Change in fair value of stock warrants Operating loss on minority interest investment Income Loss From Equity Method Investments Change in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Due from related party Increase Decrease In Due From Related Parties Accounts payable Increase Decrease In Accounts Payable Accrued compensation and other liabilities Increase Decrease In Accrued Liabilities And Other Operating Liabilities Net cash used in continuing operating activities Net Cash Provided By Used In Operating Activities Continuing Operations Net cash used in discontinued operating activities Cash Provided By Used In Operating Activities Discontinued Operations Net cash used in operating activities Net Cash Provided By Used In Operating Activities Cash flows from investing activities: Net Cash Provided By Used In Investing Activities [Abstract] Purchases of property and equipment Payments To Acquire Property Plant And Equipment Security deposit on sublease Payments To Security Deposit On Sublease Proceeds from sale of minority interest investment in former subsidiary Proceeds From Sale Of Minority Interest Investment In Former Subsidiary Net cash provided by (used in) continuing investing activities Net Cash Provided By Used In Investing Activities Continuing Operations Net cash provided by (used in) investing activities Net Cash Provided By Used In Investing Activities Cash flows from financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Net cash provided by discontinued financing activities Cash Provided By Used In Financing Activities Discontinued Operations Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Net decrease in cash, cash equivalents and restricted cash from continuing operations Cash And Cash Equivalents Period Increase Decrease Net decrease in cash, cash equivalents and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Net increase in cash and cash equivalents included in current assets held for sale Cash And Cash Equivalents Period Increase Decrease Included In Current Assets Held For Sale Cash, cash equivalents and restricted cash, beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Cash, cash equivalents and restricted cash, end of period Supplemental disclosure of non-cash investing and financing information Noncash Investing And Financing Items [Abstract] Purchases of property and equipment with capital lease obligation Capital Lease Obligations Incurred Accounting Policies [Abstract] Overview Business Description And Basis Of Presentation [Text Block] Organization Consolidation And Presentation Of Financial Statements [Abstract] Going Concern and Management's Plans Substantial Doubt About Going Concern [Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Fair Value Disclosures [Abstract] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Warrant Liability Disclosure [Text Block] Text Block [Abstract] Warrant Liabilities Warrant Liability Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Discontinued Operations And Disposal Groups [Abstract] CoSense Joint Venture Agreement and Discontinued Operations Disposal Groups Including Discontinued Operations Disclosure [Text Block] Equity [Abstract] Stockholders' Equity Shareholders Equity And Share Based Payments [Text Block] Net loss per share Earnings Per Share [Text Block] Asset acquisitions. Fair Value of Contingent Consideration Asset Acquisitions Disclosure [Text Block] Compensation Related Costs [Abstract] Compensation Plan for Board Members Compensation Related Costs General [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Recent Accounting Standards New Accounting Pronouncements Policy Policy [Text Block] Summary of Financial Instruments Measured at Fair Value on Recurring Basis Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Table [Text Block] Summary of Changes in Fair Value of Level1 and Level 3 Financial Instruments Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block] Series C Warrants [Member] Series C Warrant [Member] Series C Warrants [Member] Fair Value of Convertible Preferred Stock Warrant Liability Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques Table [Text Block] Schedule of Future Minimum Rental Payments for Operating and Capital Leases Table Text Block Schedule of Future Minimum Lease Payments Schedule Of Future Minimum Rental Payments For Operating And Capital Leases Table [Text Block] Components of Discontinued Operations Schedule Of Disposal Groups Including Discontinued Operations Income Statement Balance Sheet And Additional Disclosures [Text Block] Summary of Stock Based Compensation Expense Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Schedule of Fair Value of Award Granted Using Black-Scholes Option Pricing Model Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Summary of Stock Option Transactions Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Schedule of Calculations of Basic and Diluted Earnings Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule of Potentially Dilutive Securities Outstanding Excluded from Computations of Diluted Weighted-Average Shares Outstanding Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Working Capital Liquidity And Managements Plans [Line Items] Liquidity And Managements Plans [Table] Liquidity And Managements Plans [Table] Liquidity And Managements Plans [Table] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] Underwritten public offering. Underwritten Public Offering [Member] Underwritten Public Offering [Member] Subsequent Event Type Subsequent Event Type [Axis] Subsequent Event Type Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Liquidity And Managements Plans [Line Items] Liquidity And Managements Plans [Line Items] Net loss Positive (deficit) in working capital Working Capital Net cash used in operating activities Number of newly issued Stock Issued During Period Shares New Issues Price per unit Shares Issued Price Per Share Net proceeds from shares issued Proceeds From Issuance Of Common Stock Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Level 1 [Member] Fair Value Inputs Level1 [Member] Level 2 [Member] Fair Value Inputs Level2 [Member] Level 3 [Member] Fair Value Inputs Level3 [Member] Measurement Frequency Fair Value By Measurement Frequency [Axis] Measurement Frequency Fair Value Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value Measurements Recurring [Member] Liability Class Fair Value By Liability Class [Axis] Fair Value by Liability Class Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation By Liability Class [Domain] Convertible preferred stock warrant liability [Member] Derivative Financial Instruments Liabilities [Member] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Liabilities Liabilities Fair Value Disclosure [Abstract] Total common stock warrant and contingent consideration liability Liabilities Fair Value Disclosure Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table] Common Stock Warrant Liability [Member] Common stock warrant liability [Member] Common Stock Warrant Liability [Member] Purchase price contingent liability. Purchase price contingent liability [Member] Purchase Price Contingent Liability [Member] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation Roll Forward Balance at the beginning of period Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value Balance at the beginning of period, in shares Class Of Warrant Or Right Outstanding Change in value of liabilities Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings Balance at end of period Balance at the end of period, in shares Class Of Warrant Or Right, Warrant Term Class Of Warrant Or Right [Table] Class Of Warrant Or Right [Table] Series A Warrants to Purchase Common Stock [Member] Series A Warrants to Purchase Shares of Common Stock [Member] Series A Warrants To Purchase Common Stock [Member] IPO [Member] I P O [Member] Series B Warrants [Member] Series B Warrant Liability [Member] Series B Warrants [Member] 2017 PIPE warrant liability to purchase common stock. 2017 PIPE Warrant Liability to Purchase Common Stock [Member] Two Thousand Seventeen P I P E Warrant Liability To Purchase Common Stock [Member] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Two thousand eighteen PIPE warrant liability to purchase common stock. 2018 PIPE Warrant Liability [Member] Two Thousand Eighteen P I P E Warrant Liability To Purchase Common Stock [Member] Measurement Input Type Measurement Input Type [Axis] Measurement Input Type Measurement Input Type [Domain] Expected Dividend Yield [Member] Measurement Input Expected Dividend Rate [Member] Class Of Warrant Or Right [Line Items] Class Of Warrant Or Right [Line Items] Number of common stock purchased upon issuance of warrants Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights Exercise price of warrants exercised Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 Warrants term Class Of Warrant Or Right Warrant Term Class of Warrant Or Right, Liquidated Damages Amount, Percent of Volume Weighted Average Price Aggregate VWAP (percent) Classof Warrant Or Right Liquidated Damages Amount Percentof Volume Weighted Average Price Warrants Exercised Warrants exercised (in shares) Warrants Exercised Warrants outstanding (in shares) De-recognition Of Warrant Derivative Liability Tender offer expiration date. De-recognition of warrant liability Derecognition Of Warrant Derivative Liability Proceeds from exercise of warrants Proceeds From Warrant Exercises Tender offer expiration date Tender Offer Expiration Date Stock Issued During Period Shares Cashless Exercise Of Warrants Cashless Warrants Exercised Issuance of shares upon cashless exercise warrants (in shares) Stock Issued During Period Shares Cashless Exercise Of Warrants Proceeds from issuance of common stock under tender offer Warrants cashless exercised (in shares) Cashless Warrants Exercised Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Table] Volatility [Member] Measurement Input Price Volatility [Member] Contractual Term [Member] Measurement Input Expected Term [Member] Risk-free Rate [Member] Measurement Input Risk Free Interest Rate [Member] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] Measurement input Warrants And Rights Outstanding Measurement Input Measurement term Warrants And Rights Outstanding Term Class of Warrant or Right, Exercise Price Description Warrant issuance description Class Of Warrant Or Right Exercise Price Description Fair value of estimated warrants Warrants And Rights Outstanding Warrant to call common stock Class Of Warrant Or Right Number Of Securities Called By Each Warrant Or Right Lessee, operating lease month and year of expiration. Lessee, operating lease commencement month and year. Commitments and contingencies. Commitments and contingencies. Commitments And Contingencies [Table] Commitments And Contingencies [Table] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] Redwood City, California [Member] CALIFORNIA Scenario Statement Scenario [Axis] Scenario Scenario Unspecified [Domain] Forecast [Member] Scenario Forecast [Member] Commitments and Contingencies [Line Items] Commitments And Contingencies [Line Items] Operating lease, description Lessee Operating Lease Description Operating lease, expiration Lessee Operating Lease Month And Year Of Expiration Area of operating lease Area Of Real Estate Property Operating lease beginning date Lessee Operating Lease Commencement Month And Year Future minimum commitment under non-cancelable operating lease Operating Lease Payments Payment to acquire office furniture under operating lease Payments To Acquire Furniture And Fixtures Gross value of office furniture under capital lease Furniture And Fixtures Gross Rent expense Operating Leases Rent Expense Net Sublease income Operating Leases Rent Expense Sublease Rentals1 Operating and capital lease liability payments due. Operating and capital lease liability payments remainder of fiscal year. Operating and capital lease liability payments due year two. Operating and capital lease liability payments due year three. Capital Lease Capital Leases Future Minimum Payments Due [Abstract] Remaining of 2019 Capital Leases Future Minimum Payments Remainder Of Fiscal Year 2020 Capital Leases Future Minimum Payments Due In Two Years 2021 Capital Leases Future Minimum Payments Due In Three Years Total Capital Leases Future Minimum Payments Due Less: Amount representing interest Capital Leases Future Minimum Payments Interest Included In Payments Present value of minimum lease payments Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments Operating Lease Operating Leases Future Minimum Payments Due [Abstract] Remaining of 2019 Operating Leases Future Minimum Payments Remainder Of Fiscal Year 2020 Operating Leases Future Minimum Payments Due In Two Years 2021 Operating Leases Future Minimum Payments Due In Three Years Total Operating Leases Future Minimum Payments Due Remaining of 2019 Operating And Capital Lease Liability Payments Remainder Of Fiscal Year 2020 Operating And Capital Lease Liability Payments Due Year Two 2021 Operating And Capital Lease Liability Payments Due Year Three Total Operating And Capital Lease Liability Payments Due Required maximum investment to purchase joint venture common shares on an incremental quarterly basis commencing in December 2017. Investment threshold requirement stock issuance. Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Legal Entity Legal Entity [Axis] Entity Entity [Domain] OAHL. OAHL [Member] O A H L [Member] Investment, Name Schedule Of Equity Method Investment Equity Method Investee Name [Axis] Investment, Name Equity Method Investee Name [Domain] Capnia Inc joint venture. Capnia Inc Joint Venture [Member] Capnia Inc Joint Venture [Member] Related Party Related Party Transactions By Related Party [Axis] Related Party Related Party [Domain] Corporate Joint Venture [Member] Corporate Joint Venture [Member] Sinon Investments LLC. Sinon Investments LLC [Member] Sinon Investments L L C [Member] Disposal Group Name Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Axis] Disposal Group Name Disposal Groups Including Discontinued Operations Name [Domain] CoSenseand, NFI and Serenz. CoSense, NFI and Serenz [Member] Cosense N F Iand Serenz [Member] Disposal Group Classification Disposal Group Classification [Axis] Disposal Group Classification Disposal Group Classification [Domain] Discontinued Operations, Held-for-sale [Member] Discontinued Operations Heldforsale [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] Investment threshold requirement Investment Threshold Requirement Negotiated price per share Sale Of Stock Price Per Share Investment threshold requirement stock issuance Investment Threshold Requirement Stock Issuance Percentage of discount for lack of control. Increase decrease in minority interest investment in subsidiary. Gain loss from minority interest investment. Issuance of common stock (shares) Percentage of ownership interest Subsidiary Or Equity Method Investee Cumulative Percentage Ownership After All Transactions Current period gain recognized Sale Leaseback Transaction Current Period Gain Recognized Number of shares owned Investment Owned Balance Shares Percentage of discount for lack of control Percentage Of Discount For Lack Of Control Decrease in minority interest investment Increase Decrease In Minority Interest Investment In Subsidiary Total purchase price Business Combination Consideration Transferred1 Gain in minority interest investment Gain Loss From Minority Interest Investment Assets held for sale, current Assets Of Disposal Group Including Discontinued Operation Current Assets held for sale, long-term Disposal Group Including Discontinued Operation Assets Noncurrent Liabilities held for sale, current Liabilities Of Disposal Group Including Discontinued Operation Current Liabilities held for sale, long-term Liabilities Of Disposal Group Including Discontinued Operation Noncurrent Disposal Group Including Discontinued Operation Product Revenue Disposal Group Including Discontinued Operation Cost Of Goods Sold (Refunded) Disposal Group, Including Discontinued Operation, Research and Development Disposal Group, Including Discontinued Operation, Sales and Marketing Disposal Group, Including Discontinued Operation, Cost and Expenses Product revenue Disposal Group Including Discontinued Operation Product Revenue Cost of product revenue Disposal Group Including Discontinued Operation Cost Of Goods Sold Refunded Gross profit (loss) Disposal Group Including Discontinued Operation Gross Profit Loss Expenses Disposal Group Not Discontinued Operation Income Statement Disclosures [Abstract] Research and development Disposal Group Including Discontinued Operation Research And Development Sales and marketing Disposal Group Including Discontinued Operation Salesand Marketing General and administrative Disposal Group Including Discontinued Operation General And Administrative Expense Total expenses Disposal Group Including Discontinued Operation Cost And Expense Net loss from discontinued operations Stock-based compensation expense Allocated Share Based Compensation Expense Ownership interest, percentage of voting rights of stock. Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Stock Options [Member] Employee Stock Option [Member] Incentive Stock Options [Member] ISOs [Member] Incentive Stock Options [Member] Restricted Stock Units [Member] Restricted Stock Units R S U [Member] Employee Stock Purchase Plan [Member] Employee Stock [Member] Series D Warrants [Member] Series D Warrants [Member] Series D Warrants [Member] Warrants To Purchase Stock [Member] Warrants to Purchase Stock [Member] Warrants To Purchase Common Stock [Member] Underwriter [Member] Underwriter [Member] Underwriter [Member] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Two Thousand and Ten and Two Thousand and Twelve Convertible Promissory Notes [Member] 2010 and 2012 Convertible Promissory Notes [Member] Two Thousand And Ten And Two Thousand And Twelve Convertible Promissory Notes [Member] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Ownership interest of voting rights of all classes of stock (percent) Ownership Interest Percentageof Voting Rightsof Stock Percentage of fair market value Sharebased Compensation Arrangement By Sharebased Payment Award Purchase Price Of Common Stock Percent Vesting period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Contractual term of option Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period Number of shares available for grant Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Income tax benefits recognized from stock-based compensation Employee Service Share Based Compensation Tax Benefit From Compensation Expense Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Research and Development [Member] Research And Development Expense [Member] General and Administrative [Member] General And Administrative Expense [Member] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Total stock compensation expense Number of options granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Expected life (years) Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 Risk-free interest rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Volatility Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Dividend rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Expected dividend yield Share based compensation arrangement by share based payment award number of shares available for grant granted. Share based compensation arrangement by share based payment award number of shares available for grant exercised in period. Share based compensation arrangement by share based payment award number of shares available for grant forfeitures in period. Share based compensation arrangement by share based payment award shares available for grant roll forward. Shares Available for Grant Share Based Compensation Arrangement By Share Based Payment Award Shares Available For Grant Roll Forward Options Available, Beginning balance Options Available, Additional shares authorized Share Based Compensation Arrangement By Share Based Payment Award Number Of Additional Shares Authorized Options Available, Granted Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Granted Options Available, Exercised Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Exercised In Period Options Available, Canceled/Forfeited Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Forfeitures In Period Options Available, Ending balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward Beginning balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Options granted Options exercised Stock Issued During Period Shares Stock Options Exercised Options canceled/forfeited Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Ending balance Options vested at end of period (shares) Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Number Of Shares Options vested and expected to vest at end of period (shares) Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Weighted-Average Exercise Price per Share Sharebased Compensation Arrangementby Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value Roll Forward Beginning balance (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Options granted (in dollars per share) Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Options exercised (in dollars per share) Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Options canceled/forfeited (in dollars per share) Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price Ending balance (in dollars per share) Options vested at end of period (in dollars per share) Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value Options vested and expected to vest at end of period (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Weighted Average Remaining Contractual Term Weighted Average Remaining Contractual Term Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures [Abstract] Options outstanding at end of period Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Options vested at end of period Sharebased Compensation Arrangementby Sharebased Payment Award Options Vestedin Period Weighted Average Remaining Contractual Term Options vested and expected to vest at end of period Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 Weighted average grant date fair value per option granted (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Future stock-based compensation for unvested employee options granted and outstanding Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Future stock-based compensation, requisite service period Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Stock options outstanding, intrinsic value Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value Stock units granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Vesting percentage Sharebased Compensation Arrangement By Sharebased Payment Award Award Vesting Rights Percentage Percentage of outstanding stock maximum Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Outstanding Stock Maximum Number of shares available for issuance under the plan on the first day of each year Class of warrant or right warrants expiration date. Exercise price of warrants (in dollars per share) Warrants expiration date Class Of Warrant Or Right Warrants Expiration Date Liquidated damages amount percent of VWAP (percent) Class of warrant or right warrants expiration month and year. Warrants expiration period Class Of Warrant Or Right Warrants Expiration Month And Year Incremental common shares attributable to call options to common stock. Incremental common shares attributable to call warrants. Earnings per share basic and diluted numerator. Numerator: Earnings Per Share Basic And Diluted Numerator [Abstract] Income (loss) from continuing operations Net income (loss) - basic Net Income Loss Available To Common Stockholders Basic Less: noncash income from change in fair value of warrants Dilutive Securities Net loss - diluted Net Income Loss Available To Common Stockholders Diluted Basic weighted-average common shares outstanding Effect of dilutive securities: Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract] Options to purchase common stock Incremental Common Shares Attributable To Call Options To Common Stock Warrants Incremental Common Shares Attributable To Call Warrants Diluted weighted-average common shares outstanding Income (loss) per common shares from continuing operations, basic Income (loss) per common shares from continuing operations, diluted Loss per common share from discontinued operations, basic Loss per common share from discontinued operations, diluted Net income (loss) per common share, basic Net income (loss) per common share, diluted Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Antidilutive Securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities, Name Antidilutive Securities Name [Domain] Warrants Issued to 2010/2012 Convertible Note Holders to Purchase Common Stock [Member] Convertible Debt Securities [Member] Options to Purchase Common Stock [Member] Stock Option [Member] Warrants Issued in 2009 to Purchase Common Stock [Member] Warrant [Member] Series C Warrant To Purchase Common Stock [Member] Series C Warrant to Purchase Common Stock [Member] Series C Warrant To Purchase Common Stock [Member] Series D Warrant To Purchase Common Stock [Member] Series D Warrant To Purchase Common Stock [Member] Series D Warrant To Purchase Common Stock [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive securities excluded from computations of diluted weighted-average shares outstanding Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Asset acquisition contingent consideration arrangements. Asset Acquisitions [Abstract] Asset Acquisitions [Abstract] Asset acquisition. Acquisitions [Table] Acquisitions [Table] Acquisitions [Table] Contingent Consideration by Type Contingent Consideration By Type [Axis] Contingent Consideration Type Contingent Consideration Type [Domain] Earnout Payments [Member] Earnout Payments [Member] Earnout Payments [Member] Measurement Basis Fair Value By Measurement Basis [Axis] Fair Value Disclosure Item Amounts [Default] Portion At Fair Value Fair Value Disclosure [Member] Fair Value Measurement Fair Value Disclosure Item Amounts [Domain] Changes Measurement [Member] Change During Period Fair Value Disclosure [Member] Measurement Input, Discount Rate [Member] Measurement Input Discount Rate [Member] Asset Acquisition [Line Items] Asset Acquisition [Line Items] Maximum potential cash earnout payments Asset Acquisition Contingent Consideration Arrangements Asset acquisition fair value of stock consideration. Asset acquisition fair value of cash consideration. Asset acquisition consideration transferred. Fair value of stock consideration Asset Acquisition Fair Value Of Stock Consideration Fair value of cash consideration Asset Acquisition Fair Value Of Cash Consideration Total purchase price consideration Asset Acquisition Consideration Transferred1 Asset acquisition assumed deferred tax liabilities. Value of deferred tax liability assumed Asset Acquisition Assumed Deferred Tax Liabilities Increase (decrease) in valuation allowance Valuation Allowance Deferred Tax Asset Change In Amount Asset acquisition contingent consideration liability measurement input. Fair value inputs, discount rate (percent) Asset Acquisition Contingent Consideration Liability Measurement Input First commercial sales milestone. Second commercial sales milestone. Contingent liability payment on achievement of sales milestone. First commercial sales milestone First Commercial Sales Milestone Second commercial sales milestone Second Commercial Sales Milestone Contingent liability payment on achievement of sales milestone Contingent Liability Payment On Achievement Of Sales Milestone Schedule Of Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits By Title Of Individual And By Type Of Deferred Compensation [Table] Schedule Of Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits By Title Of Individual And By Type Of Deferred Compensation [Table] Title of Individual Title Of Individual [Axis] Title of Individual Title Of Individual With Relationship To Entity [Domain] Board of Directors [Member] Director [Member] Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items] Number of shares issued upon full exercise of underwriters options to purchase additional shares. Subsequent Event [Table] Subsequent Event [Table] Subsequent Event [Line Items] Subsequent Event [Line Items] Number of newly issued shares Shares issued upon exercise of underwriters options Number Of Shares Issued Upon Full Exercise Of Underwriters Options To Purchase Additional Shares Shares issued price per share Net proceeds from issuance of public offering Proceeds From Issuance Initial Public Offering